GENERAL DESCRIPTION
The ST90E30, ST90E31, ST90T30 and ST90T31 (following mentioned as ST90E3X) are EPROM members of the ST9 family of microcontrollers, in windowed ceramic (E) and plastic OTP (T) packages respectively, completely developed and produced by SGS-THOMSON Microelectronics using a proprietary n-well HCMOS process.